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【多选题】
与1mol HBr在-80度反应的描述正确的有
A.
1,2-加成
B.
共轭加成
C.
亲电反应
D.
主产物是
E.
主产物是
F.
1,4-加成
G.
中间体是碳正离子
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参考答案:
举一反三
【判断题】The detective warned the Croydons that the police might come at any time, so they'd better drive north to any of the cities where the accident would be unknown.( )
A.
正确
B.
错误
【单选题】下列加点字读音正确的一项是( )
A.
苌( ch á ng )弘 孰能 (guō)     阿谀奉承(yú)   师 襄 ( xi ā ng)
B.
跬 步(guǐ)   经传(zhuàn) 以贻 (wèi) 之 苌 (ch á ng) 弘
C.
骐 骥(qí)      句读(dòu)      颁白(bān)     老 聃 (dān)
D.
驽 马(nú)      郯子(tán)      针砭(biǎn) 无长 (zh ǎ ng) 无少
【判断题】金樱子要挖去毛
A.
正确
B.
错误
【简答题】With the advances of fabrication techniques, the crossover region between these two fundamental regimes has been the subjects of intense experimental and theoretical investigation. The system that fal...
【简答题】B货翡翠在反射光照明下,主要鉴定特征有:()()()。
【单选题】Why did the police officer come to the hotel?
A.
To check up fire safety work.
B.
To work out a fire evacuation plan.
C.
To remove the cardboard boxes.
D.
To check in the hotel.
【简答题】Listen and answer the following questions. Feb. 26 th 1. Was Raoul going to marry Christine? What did his brother Philippe think of his idea? _______________________________________________________...
【单选题】需要挖去毛的药材是
A.
鹿茸
B.
香附
C.
金樱子
D.
狗脊
【判断题】金樱子要挖去毛
A.
正确
B.
错误
【简答题】Apparently, we are safe neither at home nor in the business office. We use wa- ter in both places, but the above-mentioned research shows that chemicals added to our local water supply to kill harmful...
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